[linux-2.6-block.git] / arch / arm64 / mm / init.c

/*
 * Based on arch/arm/mm/init.c
 *
 * Copyright (C) 1995-2005 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/sort.h>
#include <linux/of_fdt.h>
#include <linux/dma-mapping.h>
#include <linux/dma-contiguous.h>
#include <linux/efi.h>

#include <asm/fixmap.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>

#include "mm.h"

phys_addr_t memstart_addr __read_mostly = 0;

#ifdef CONFIG_BLK_DEV_INITRD
static int __init early_initrd(char *p)
{
	unsigned long start, size;
	char *endp;

	start = memparse(p, &endp);
	if (*endp == ',') {
		size = memparse(endp + 1, NULL);

		initrd_start = (unsigned long)__va(start);
		initrd_end = (unsigned long)__va(start + size);
	}
	return 0;
}
early_param("initrd", early_initrd);
#endif

/*
 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
 * currently assumes that for memory starting above 4G, 32-bit devices will
 * use a DMA offset.
 */
static phys_addr_t max_zone_dma_phys(void)
{
	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
}

static void __init zone_sizes_init(unsigned long min, unsigned long max)
{
	struct memblock_region *reg;
	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	unsigned long max_dma = min;

	memset(zone_size, 0, sizeof(zone_size));

	/* 4GB maximum for 32-bit only capable devices */
	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
		max_dma = PFN_DOWN(max_zone_dma_phys());
		zone_size[ZONE_DMA] = max_dma - min;
	}
	zone_size[ZONE_NORMAL] = max - max_dma;

	memcpy(zhole_size, zone_size, sizeof(zhole_size));

	for_each_memblock(memory, reg) {
		unsigned long start = memblock_region_memory_base_pfn(reg);
		unsigned long end = memblock_region_memory_end_pfn(reg);

		if (start >= max)
			continue;

		if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
			unsigned long dma_end = min(end, max_dma);
			zhole_size[ZONE_DMA] -= dma_end - start;
		}

		if (end > max_dma) {
			unsigned long normal_end = min(end, max);
			unsigned long normal_start = max(start, max_dma);
			zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
		}
	}

	free_area_init_node(0, zone_size, min, zhole_size);
}

#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
	return memblock_is_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);
#endif

#ifndef CONFIG_SPARSEMEM
static void arm64_memory_present(void)
{
}
#else
static void arm64_memory_present(void)
{
	struct memblock_region *reg;

	for_each_memblock(memory, reg)
		memory_present(0, memblock_region_memory_base_pfn(reg),
			       memblock_region_memory_end_pfn(reg));
}
#endif

void __init arm64_memblock_init(void)
{
	phys_addr_t dma_phys_limit = 0;

	/*
	 * Register the kernel text, kernel data, initrd, and initial
	 * pagetables with memblock.
	 */
	memblock_reserve(__pa(_text), _end - _text);
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
#endif

	early_init_fdt_scan_reserved_mem();

	/* 4GB maximum for 32-bit only capable devices */
	if (IS_ENABLED(CONFIG_ZONE_DMA))
		dma_phys_limit = max_zone_dma_phys();
	dma_contiguous_reserve(dma_phys_limit);

	memblock_allow_resize();
	memblock_dump_all();
}

void __init bootmem_init(void)
{
	unsigned long min, max;

	min = PFN_UP(memblock_start_of_DRAM());
	max = PFN_DOWN(memblock_end_of_DRAM());

	/*
	 * Sparsemem tries to allocate bootmem in memory_present(), so must be
	 * done after the fixed reservations.
	 */
	arm64_memory_present();

	sparse_init();
	zone_sizes_init(min, max);

	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	max_pfn = max_low_pfn = max;
}

#ifndef CONFIG_SPARSEMEM_VMEMMAP
static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
{
	struct page *start_pg, *end_pg;
	unsigned long pg, pgend;

	/*
	 * Convert start_pfn/end_pfn to a struct page pointer.
	 */
	start_pg = pfn_to_page(start_pfn - 1) + 1;
	end_pg = pfn_to_page(end_pfn - 1) + 1;

	/*
	 * Convert to physical addresses, and round start upwards and end
	 * downwards.
	 */
	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;

	/*
	 * If there are free pages between these, free the section of the
	 * memmap array.
	 */
	if (pg < pgend)
		free_bootmem(pg, pgend - pg);
}

/*
 * The mem_map array can get very big. Free the unused area of the memory map.
 */
static void __init free_unused_memmap(void)
{
	unsigned long start, prev_end = 0;
	struct memblock_region *reg;

	for_each_memblock(memory, reg) {
		start = __phys_to_pfn(reg->base);

#ifdef CONFIG_SPARSEMEM
		/*
		 * Take care not to free memmap entries that don't exist due
		 * to SPARSEMEM sections which aren't present.
		 */
		start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
		/*
		 * If we had a previous bank, and there is a space between the
		 * current bank and the previous, free it.
		 */
		if (prev_end && prev_end < start)
			free_memmap(prev_end, start);

		/*
		 * Align up here since the VM subsystem insists that the
		 * memmap entries are valid from the bank end aligned to
		 * MAX_ORDER_NR_PAGES.
		 */
		prev_end = ALIGN(start + __phys_to_pfn(reg->size),
				 MAX_ORDER_NR_PAGES);
	}

#ifdef CONFIG_SPARSEMEM
	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
		free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
}
#endif	/* !CONFIG_SPARSEMEM_VMEMMAP */

/*
 * mem_init() marks the free areas in the mem_map and tells us how much memory
 * is free.  This is done after various parts of the system have claimed their
 * memory after the kernel image.
 */
void __init mem_init(void)
{
	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);

#ifndef CONFIG_SPARSEMEM_VMEMMAP
	free_unused_memmap();
#endif
	/* this will put all unused low memory onto the freelists */
	free_all_bootmem();

	mem_init_print_info(NULL);

#define MLK(b, t) b, t, ((t) - (b)) >> 10
#define MLM(b, t) b, t, ((t) - (b)) >> 20
#define MLG(b, t) b, t, ((t) - (b)) >> 30
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)

	pr_notice("Virtual kernel memory layout:\n"
		  "    vmalloc : 0x%16lx - 0x%16lx   (%6ld GB)\n"
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld GB maximum)\n"
		  "              0x%16lx - 0x%16lx   (%6ld MB actual)\n"
#endif
		  "    PCI I/O : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "    fixed   : 0x%16lx - 0x%16lx   (%6ld KB)\n"
		  "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "      .init : 0x%p" " - 0x%p" "   (%6ld KB)\n"
		  "      .text : 0x%p" " - 0x%p" "   (%6ld KB)\n"
		  "      .data : 0x%p" " - 0x%p" "   (%6ld KB)\n",
		  MLG(VMALLOC_START, VMALLOC_END),
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  MLG((unsigned long)vmemmap,
		      (unsigned long)vmemmap + VMEMMAP_SIZE),
		  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
		      (unsigned long)virt_to_page(high_memory)),
#endif
		  MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M),
		  MLK(FIXADDR_START, FIXADDR_TOP),
		  MLM(MODULES_VADDR, MODULES_END),
		  MLM(PAGE_OFFSET, (unsigned long)high_memory),
		  MLK_ROUNDUP(__init_begin, __init_end),
		  MLK_ROUNDUP(_text, _etext),
		  MLK_ROUNDUP(_sdata, _edata));

#undef MLK
#undef MLM
#undef MLK_ROUNDUP

	/*
	 * Check boundaries twice: Some fundamental inconsistencies can be
	 * detected at build time already.
	 */
#ifdef CONFIG_COMPAT
	BUILD_BUG_ON(TASK_SIZE_32			> TASK_SIZE_64);
#endif
	BUILD_BUG_ON(TASK_SIZE_64			> MODULES_VADDR);
	BUG_ON(TASK_SIZE_64				> MODULES_VADDR);

	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
		extern int sysctl_overcommit_memory;
		/*
		 * On a machine this small we won't get anywhere without
		 * overcommit, so turn it on by default.
		 */
		sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	}
}

void free_initmem(void)
{
	free_initmem_default(0);
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (!keep_initrd) {
		if (start == initrd_start)
			start = round_down(start, PAGE_SIZE);
		if (end == initrd_end)
			end = round_up(end, PAGE_SIZE);

		free_reserved_area((void *)start, (void *)end, 0, "initrd");
	}
}

static int __init keepinitrd_setup(char *__unused)
{
	keep_initrd = 1;
	return 1;
}

__setup("keepinitrd", keepinitrd_setup);
#endif
Commit	Line	Data
c1cc1552 CM	1	/*
	2	* Based on arch/arm/mm/init.c
	3	*
	4	* Copyright (C) 1995-2005 Russell King
	5	* Copyright (C) 2012 ARM Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/export.h>
	22	#include <linux/errno.h>
	23	#include <linux/swap.h>
	24	#include <linux/init.h>
	25	#include <linux/bootmem.h>
	26	#include <linux/mman.h>
	27	#include <linux/nodemask.h>
	28	#include <linux/initrd.h>
	29	#include <linux/gfp.h>
	30	#include <linux/memblock.h>
	31	#include <linux/sort.h>
	32	#include <linux/of_fdt.h>
19e7640d	33	#include <linux/dma-mapping.h>
6ac2104d	34	#include <linux/dma-contiguous.h>
86c8b27a	35	#include <linux/efi.h>
c1cc1552	36
08375198	37	#include <asm/fixmap.h>
c1cc1552 CM	38	#include <asm/sections.h>
	39	#include <asm/setup.h>
	40	#include <asm/sizes.h>
	41	#include <asm/tlb.h>
	42
	43	#include "mm.h"
	44
c1cc1552 CM	45	phys_addr_t memstart_addr __read_mostly = 0;
c1cc1552 CM	46
ec2eaa73	47	#ifdef CONFIG_BLK_DEV_INITRD
c1cc1552 CM	48	static int __init early_initrd(char *p)
	49	{
	50	unsigned long start, size;
	51	char *endp;
	52
	53	start = memparse(p, &endp);
	54	if (*endp == ',') {
	55	size = memparse(endp + 1, NULL);
	56
ec2eaa73 RH	57	initrd_start = (unsigned long)__va(start);
ec2eaa73 RH	58	initrd_end = (unsigned long)__va(start + size);
c1cc1552 CM	59	}
	60	return 0;
	61	}
	62	early_param("initrd", early_initrd);
ec2eaa73	63	#endif
c1cc1552	64
d50314a6 CM	65	/*
	66	* Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
	67	* currently assumes that for memory starting above 4G, 32-bit devices will
	68	* use a DMA offset.
	69	*/
	70	static phys_addr_t max_zone_dma_phys(void)
	71	{
	72	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
	73	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
	74	}
	75
c1cc1552 CM	76	static void __init zone_sizes_init(unsigned long min, unsigned long max)
	77	{
	78	struct memblock_region *reg;
	79	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
19e7640d	80	unsigned long max_dma = min;
c1cc1552 CM	81
	82	memset(zone_size, 0, sizeof(zone_size));
	83
c1cc1552	84	/* 4GB maximum for 32-bit only capable devices */
19e7640d	85	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
d50314a6	86	max_dma = PFN_DOWN(max_zone_dma_phys());
19e7640d CM	87	zone_size[ZONE_DMA] = max_dma - min;
	88	}
	89	zone_size[ZONE_NORMAL] = max - max_dma;
c1cc1552 CM	90
	91	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	92
	93	for_each_memblock(memory, reg) {
	94	unsigned long start = memblock_region_memory_base_pfn(reg);
	95	unsigned long end = memblock_region_memory_end_pfn(reg);
	96
	97	if (start >= max)
	98	continue;
19e7640d CM	99
	100	if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
	101	unsigned long dma_end = min(end, max_dma);
	102	zhole_size[ZONE_DMA] -= dma_end - start;
c1cc1552	103	}
19e7640d CM	104
19e7640d CM	105	if (end > max_dma) {
c1cc1552	106	unsigned long normal_end = min(end, max);
19e7640d	107	unsigned long normal_start = max(start, max_dma);
c1cc1552 CM	108	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	109	}
	110	}
	111
	112	free_area_init_node(0, zone_size, min, zhole_size);
	113	}
	114
	115	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	116	int pfn_valid(unsigned long pfn)
	117	{
	118	return memblock_is_memory(pfn << PAGE_SHIFT);
	119	}
	120	EXPORT_SYMBOL(pfn_valid);
	121	#endif
	122
	123	#ifndef CONFIG_SPARSEMEM
	124	static void arm64_memory_present(void)
	125	{
	126	}
	127	#else
	128	static void arm64_memory_present(void)
	129	{
	130	struct memblock_region *reg;
	131
	132	for_each_memblock(memory, reg)
	133	memory_present(0, memblock_region_memory_base_pfn(reg),
	134	memblock_region_memory_end_pfn(reg));
	135	}
	136	#endif
	137
	138	void __init arm64_memblock_init(void)
	139	{
2d5a5612 CM	140	phys_addr_t dma_phys_limit = 0;
2d5a5612 CM	141
bd00cd5f MR	142	/*
	143	* Register the kernel text, kernel data, initrd, and initial
	144	* pagetables with memblock.
	145	*/
c1cc1552 CM	146	memblock_reserve(__pa(_text), _end - _text);
c1cc1552 CM	147	#ifdef CONFIG_BLK_DEV_INITRD
ec2eaa73 RH	148	if (initrd_start)
ec2eaa73 RH	149	memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
c1cc1552 CM	150	#endif
c1cc1552 CM	151
0ceac9e0	152	early_init_fdt_scan_reserved_mem();
2d5a5612 CM	153
	154	/* 4GB maximum for 32-bit only capable devices */
	155	if (IS_ENABLED(CONFIG_ZONE_DMA))
d50314a6	156	dma_phys_limit = max_zone_dma_phys();
2d5a5612	157	dma_contiguous_reserve(dma_phys_limit);
6ac2104d	158
c1cc1552 CM	159	memblock_allow_resize();
	160	memblock_dump_all();
	161	}
	162
	163	void __init bootmem_init(void)
	164	{
	165	unsigned long min, max;
	166
	167	min = PFN_UP(memblock_start_of_DRAM());
	168	max = PFN_DOWN(memblock_end_of_DRAM());
	169
	170	/*
	171	* Sparsemem tries to allocate bootmem in memory_present(), so must be
	172	* done after the fixed reservations.
	173	*/
	174	arm64_memory_present();
	175
	176	sparse_init();
	177	zone_sizes_init(min, max);
	178
	179	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	180	max_pfn = max_low_pfn = max;
	181	}
	182
c1cc1552 CM	183	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	184	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	185	{
	186	struct page start_pg, end_pg;
	187	unsigned long pg, pgend;
	188
	189	/*
	190	* Convert start_pfn/end_pfn to a struct page pointer.
	191	*/
	192	start_pg = pfn_to_page(start_pfn - 1) + 1;
	193	end_pg = pfn_to_page(end_pfn - 1) + 1;
	194
	195	/*
	196	* Convert to physical addresses, and round start upwards and end
	197	* downwards.
	198	*/
	199	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	200	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	201
	202	/*
	203	* If there are free pages between these, free the section of the
	204	* memmap array.
	205	*/
	206	if (pg < pgend)
	207	free_bootmem(pg, pgend - pg);
	208	}
	209
	210	/*
	211	* The mem_map array can get very big. Free the unused area of the memory map.
	212	*/
	213	static void __init free_unused_memmap(void)
	214	{
	215	unsigned long start, prev_end = 0;
	216	struct memblock_region *reg;
	217
	218	for_each_memblock(memory, reg) {
	219	start = __phys_to_pfn(reg->base);
	220
	221	#ifdef CONFIG_SPARSEMEM
	222	/*
	223	* Take care not to free memmap entries that don't exist due
	224	* to SPARSEMEM sections which aren't present.
	225	*/
	226	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	227	#endif
	228	/*
	229	* If we had a previous bank, and there is a space between the
	230	* current bank and the previous, free it.
	231	*/
	232	if (prev_end && prev_end < start)
	233	free_memmap(prev_end, start);
	234
	235	/*
	236	* Align up here since the VM subsystem insists that the
	237	* memmap entries are valid from the bank end aligned to
	238	* MAX_ORDER_NR_PAGES.
	239	*/
	240	prev_end = ALIGN(start + __phys_to_pfn(reg->size),
	241	MAX_ORDER_NR_PAGES);
	242	}
	243
	244	#ifdef CONFIG_SPARSEMEM
	245	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
	246	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
247	#endif
248	}
249	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
250
251	/*
252	* mem_init() marks the free areas in the mem_map and tells us how much memory
253	* is free. This is done after various parts of the system have claimed their
254	* memory after the kernel image.
255	*/
256	void __init mem_init(void)
257	{
a6583c7c	258	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
c1cc1552 CM	259
c1cc1552 CM	260	#ifndef CONFIG_SPARSEMEM_VMEMMAP
c1cc1552 CM	261	free_unused_memmap();
c1cc1552 CM	262	#endif
bee4ebd1	263	/* this will put all unused low memory onto the freelists */
0c988534	264	free_all_bootmem();
c1cc1552	265
6879ea83	266	mem_init_print_info(NULL);
c1cc1552 CM	267
	268	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	269	#define MLM(b, t) b, t, ((t) - (b)) >> 20
08375198	270	#define MLG(b, t) b, t, ((t) - (b)) >> 30
c1cc1552 CM	271	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
	272
	273	pr_notice("Virtual kernel memory layout:\n"
08375198	274	" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n"
c1cc1552	275	#ifdef CONFIG_SPARSEMEM_VMEMMAP
08375198 CM	276	" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
08375198 CM	277	" 0x%16lx - 0x%16lx (%6ld MB actual)\n"
c1cc1552	278	#endif
08375198 CM	279	" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n"
08375198 CM	280	" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n"
c1cc1552 CM	281	" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
c1cc1552 CM	282	" memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
08375198 CM	283	" .init : 0x%p" " - 0x%p" " (%6ld KB)\n"
	284	" .text : 0x%p" " - 0x%p" " (%6ld KB)\n"
	285	" .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
	286	MLG(VMALLOC_START, VMALLOC_END),
c1cc1552	287	#ifdef CONFIG_SPARSEMEM_VMEMMAP
08375198 CM	288	MLG((unsigned long)vmemmap,
08375198 CM	289	(unsigned long)vmemmap + VMEMMAP_SIZE),
c1cc1552 CM	290	MLM((unsigned long)virt_to_page(PAGE_OFFSET),
	291	(unsigned long)virt_to_page(high_memory)),
	292	#endif
08375198 CM	293	MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M),
08375198 CM	294	MLK(FIXADDR_START, FIXADDR_TOP),
c1cc1552 CM	295	MLM(MODULES_VADDR, MODULES_END),
c1cc1552 CM	296	MLM(PAGE_OFFSET, (unsigned long)high_memory),
c1cc1552 CM	297	MLK_ROUNDUP(__init_begin, __init_end),
	298	MLK_ROUNDUP(_text, _etext),
	299	MLK_ROUNDUP(_sdata, _edata));
	300
	301	#undef MLK
	302	#undef MLM
	303	#undef MLK_ROUNDUP
	304
	305	/*
	306	* Check boundaries twice: Some fundamental inconsistencies can be
	307	* detected at build time already.
	308	*/
	309	#ifdef CONFIG_COMPAT
	310	BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
	311	#endif
	312	BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	313	BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	314
bee4ebd1	315	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
c1cc1552 CM	316	extern int sysctl_overcommit_memory;
	317	/*
	318	* On a machine this small we won't get anywhere without
	319	* overcommit, so turn it on by default.
	320	*/
	321	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	322	}
	323	}
	324
	325	void free_initmem(void)
	326	{
9af5b807	327	free_initmem_default(0);
c1cc1552 CM	328	}
	329
	330	#ifdef CONFIG_BLK_DEV_INITRD
	331
	332	static int keep_initrd;
	333
	334	void free_initrd_mem(unsigned long start, unsigned long end)
	335	{
421520ba YW	336	if (!keep_initrd) {
	337	if (start == initrd_start)
	338	start = round_down(start, PAGE_SIZE);
	339	if (end == initrd_end)
	340	end = round_up(end, PAGE_SIZE);
	341
9af5b807	342	free_reserved_area((void )start, (void )end, 0, "initrd");
421520ba	343	}
c1cc1552 CM	344	}
	345
	346	static int __init keepinitrd_setup(char *__unused)
	347	{
	348	keep_initrd = 1;
	349	return 1;
	350	}
	351
	352	__setup("keepinitrd", keepinitrd_setup);
	353	#endif